Advantages and Disadvantages of ASK, FSK and PSK
The variants of basic PSK and ASK modulations are QAM, 16-QAM, 64-QAM and so on. PSK modulation is widely used in wireless transmission. It is a power efficient system but it has lower bandwidth efficiency. In case of PSK probability of error is less. In PSK modulation, NRZ signalling is used. If s(t) = A*cos(2*π*fc*t) for Binary 1 than Figure depicts Binary Phase Shift Keying modulation type of PSK.Īs shown in the figure, Binary 1 is represented by 180 degree phase of the carrier and binary 0 is represented byīinary PSK can be represented by following equation : The RF carrier is changed based on digital input. It is digital modulation technique where in phase of The short form of Phase Shift Keying is referred as PSK. In MFSK (Multiple FSK), more than one bits are represented by Than two frequencies have been developed. In order to overcome drawbacks of BFSK (Two level Binary FSK), multiple FSK modulation techniques with more It has increased immunity to noise but requires larger bandwidth compare. This technique is widely employed in modem design and development. In case of FSK, Pe is less and SNR is high. In FSK modulation, NRZ signalling method is used. Figure depicts that binary 1 is represented by high frequency 'f1' andīinary 0 is represented by low frequency 'f2'.īinary FSK can be represented by following equation: As shown, binary 1 and 0 is represented by In this technique, frequency of the RF carrier is varied in accodance with baseband digital input. The short form of Frequency Shift Keying is referred as FSK. ASK is a bandwidth efficient system but. It has lowest noise immunity against noise. In ASK probability of error (Pe) is high and SNR is less. 
Refer OOK vs ASK modulation > which compares OOK vs ASK and depictsĭifference between OOK and ASK modulation types with signal diagrams. Known as OOK modulation (On Off Keying modulation). The form of ASK where in no carrier is transmitted during the transmission of logic zero is Here A2 is greater in magnitude compare to A1. Often in ASK modulation, binary-1 is represented by carrier with amplitude-A2 andīinary-0 is represented by carrier with amplitude-A1. no carrier).ĪSK modulation can be represented by following equation: Signal with some amplitude while binary 0 will be represented by carrier of zero amplitude(i.e. As shown in the figure, binary 1 will be represented by carrier The figure depicts operation of ASK modulation. In this technique, amplitude of the RF carrier is varied in accordance with baseband digital input signal. The short form of Amplitude Shift Keying is referred as ASK. Input binary data is referred as modulating signal and
Unlike Analog modulation, here input is in digitalīinary form. This page on ASK vs FSK vs PSK provides difference between ASK, FSK, PSK modulation types.Īll these are digital modulation techniques. ASK vs FSK vs PSK-Difference between ASK,FSK,PSK modulation
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